I want to write a application in "C" a small application for small kids.
This has to be installed in computers all OS. The application when double clicked will seek number and do add and substract. Very simple but i am beginner. Please tell me how.

Please seek advice in telling me which compiler and linker to download, I just have Internet and cannot afford to buy compiler/linker or IDE. So please advice me on how to download a good free compiler and linker.

2. Once i get the executable, i want to make it application so that i send it online to various schools to install and execute like many experts applications here.

Regards
-- Sanjay